+----------------COMP:V-N(in)----------------+    
      +----------SUBJ:V-N---------+         +------------MOD_ATT:N-N-----------+    
      +----COMP:N-N(of)---+       |         |                +---MOD_ATT:N-N---+    
      |           +MOD_ATT+       |         |                |          +MOD_AT+    
      |           |       |       |         |                |          |      |    
 Expression of __SP__ __NODE__ occurs in uterus from periimplantation stage __SP__ .
COMP:N-N(of) (expression,__NODE__)
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,__SP__)
MOD_ATT:N-N (__SP__,uterus)
MOD_ATT:N-N (__SP__,periimplantation)
MOD_ATT:N-N (__SP__,stage)